Method for making the search coil assembly for metal detectors
US4819321A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Aug 18, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49071
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A coil assembly for a metal detector and a method for making coil assemblies for metal detectors of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame have an aperture therethrough for the passage of material undergoing inspection, applying a coating of carbon material to the exterior of the frame, applying a layer of plastic material over the carbon material, winding electrically conductive strands over the plastic material, fixing the frame to a rigid metal housing providing an enclosed void around the exterior of the coated frame and strands, and applying foam plastic in liquid form to the frame and strands until the void is filled with the foam plastic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.